Table of contents

Fingerprint click is the simplest way to integrate biometric security to your design. The smallest optical touch fingerprint sensor in the world is featured on the click — GTS-511E2. The sensor takes a digital image of the fingerprint pattern using visible light.

Windows application

Fingerprint click carries an STM32 MCU for processing the images and forwarding them to an external MCU or PC. We created a Windows application that provides an interface so you can easily use the Fingerprint click. The following steps describe how the application works:

1. Place your finger on the sensor on the click.

2. Press the button in the bottom, left corner of the screen.

3. After you see the image of your fingerprint, press the button at the bottom, right corner of the screen to save the image. If you want to add more fingerprint images just repeat the process.

CMOS image sensor

A CMOS image sensor is the main component in most digital cameras today. Compared to a CCD sensor it has low power consumption and low dissipation.

To distinguish between 2D images and a real fingerprint the CMOS image sensor has a special lens and covering. Considering how dark it is when you press your finger to the lens, an LED illuminates it from one side, while the other side does the job of sending the image through the lens to the processor.

Downloads

Fingerprint scanners are chiefly used in biometric security applications

On-board modules

GTS-511E2

Key Features

Onboard STM32F415RG MCU, Mini USB connector, Additional GPIO pins

Key Benefits

Comes with free Windows application. DLL files for interfacing with the click also available

Interface

SPI,USB,UART,GPIO

Input Voltage

3.3V

Compatibility

mikroBUS

Click board size

L (57.15 x 25.4 mm)

The board can work as a standalone USB HID, using the Fingerprint PC application, or as an SPI slave communicating with a host MCU. USB HID is a USB human interface device.

Features and usage notes

CMOS image sensor

A CMOS image sensor is the main component in most digital cameras today. Compared to a CCD sensor it has low power consumption and low dissipation.

To distinguish between 2D images and a real fingerprint the CMOS image sensor has a special lens and covering. Considering how dark it is when you press your finger to the lens, an LED illuminates it from one side, while the other side does the job of sending the image through the lens to the processor.

Windows application

Fingerprint click carries an STM32 MCU for processing the images and forwarding them to an external MCU or PC. We created a Windows application that provides an interface so you can easily use the Fingerprint click. The following steps describe how the application works:

1.Place your finger on the sensor on the click.

2.Press the button in the bottom, left corner of the screen.

3.After you see the image of your fingerprint, press the button at the bottom, right corner of the screen to save the image. If you want to add more fingerprint images just repeat the process.

Pinout diagram

This table shows how the pinout on Fingerprint click corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).

Notes

Pin

mikroBUStm

Pin

Notes

MCU ready pin

READY#

1

AN

PWM

16

NC

NC

2

RST

INT

15

NC

SPI chip select pin

CS#

3

CS

TX

14

MCU_RX

UART transfer pin

SPI clock pin

MCU_SKC

4

SCK

RX

13

MCU_TX

UART receive pin

SPI master in slave out pin for the MCU

MCU_MISO

5

MISO

SCL

12

NC

SPI master out slave in pin for the MCU

MCU_MOSI

6

MOSI

SDA

11

NC

+3.3V power input

3.3V

7

+3.3V

+5V

10

NC

Ground

GND

8

GND

GND

9

GND

Ground

Programming

This code initializes SPI communication and the TFT display. After waiting for the Fingerprint click to go out of bootloader mode, the MCU sends a series of SPI commands for the Fingerprint to capture and send the fingerprint image. Every image byte received from the click is being sent onto the TFT display